Pump



A. BOULADE.

PUMP, KPPLICATION FILED ocr. 19, 1918.

1,340,597. Patented May 18, 1920.

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ANTONIN BOUTJADE, 0F LYON, FRANCE, ASSIGNOR '10 SO GIE'IE DU CABBURATEUR ZENITH, OF LYON, FRANCE.

PUMP.

Specification of Letters Patent.

Application filed. October 19, 1918. Serial No. 258,819.

To all whom it may concern:

Be it known that I, ANTONIN BOULADE, a citizen of the Republic of France, residing at Lyon, France, have invented a new and useful Improvement in Pumps, of which the following is a full, clear, and exact descrlption, reference being had to the accompanying drawings, forming part of this speolfication, in which- Figure 1 is a diagrammatic view illustrating the general arrangement and mode of operation of the pump.

Fig. 2 is a vertical section of a pump embodying my invention, and

Fig. 3 is a section on the line III-III- of Figi 2. V

y invention has relation to pumps, and is designed to provide a pump which 1s especially adapted for pumping gasolene or other liquids which should not come in contact with rubbing mechanical parts.

A further object of the invention is to provide a pump of this character in which means is provided for positively preventing any passage of the gasolene or other liquid being pumped into the pump cylinder. A stillfurther object is to provide an improved arrangement of the valve operating means and also of the means for keeping the parts properly lubricated.

Referring to the accompanying drawings, in which I have shown a preferred embodiment of my invention, and which will now be described, the numeral 2 designates a pump cylinder in which reoiprocates a piston 3. This piston is formed with a transverse opening through which extends the pump shaft 4;. Within this transverse opening the shaft 41 carries an eccentric 5 which is adapted to contact with the wear-plates 6 on the piston and effect the reciprocation of the latter.

' 7 designates a chamber into which the liquid is pumped and from which it is discharged. This chamber is located at one side of and below the cylinder 2 and communicates with the upper portion of said cylinder by the conduits 8 and passage 9, both conduits 8 joining the said passage at their upper ends Communication between the passages 8 and the passage 9 is controlled bymeans of a valve 10 having a seat at 11 and provided with a depending stem 12 which extends through the bushing 18 and within a follower 14 which is in contact with the cam or eccentric 15 and'the shaft 4. 16 designates the inlet pipe for the gasolene or other fluid being pumped and which opens within a chamber 17 which communicates with the chamber 7 through a port 18 controlled by the upwardly seating valve 19. This valve is normally held open by a spring 20 and is arranged to be positively seated by the action of the cam or eccentric 21 on the shaft 4 which engages the follower 22 into which the stem of the valve extends. Except for the fact that this valve is reversed with respect to the valve 16, its construction, seating and mode of operation is substantially the same as that of the valve 10.

23 is an outlet connection leading from the chamber 7 by way of a port 24, which is controlled by an upwardly seating valve 25, similar to the Valve 19, and arranged to be actuated by a cam or eccentric 26 on the shaft 4:.

To insure proper lubrication of the pump, oil is fed in through the condui 27. This conduit has a branch 28 leading downwardly to the cam 26 and by means of which this cam is kept lubricated. Some of the lubricant also flows to the valve guide 13 and from this point is brought through the annulus 29 to the conduit 30 to thereby lubricate the cam 21. ,As the cam followers make a good sliding fit with the body of the pump casing, there will always be an oil seal at the lower part of the said valve guide, liovhdich is preferably a forced fit in the pump 0 y. tween the valve and its guide; and if there is much play between those pieces the result is an oil leakage past the oil stem. Oil which flows through the conduits 27 and 28 finds its way through the conduits 31 and 32, to thereby lubricate the cam followers of the valves 19 and 25 and their stems.

The cylinder is provided with one or more orifices 33 vwhich communicate with the atmosphere and which are arranged to be opened when the piston is at the limit of its down stroke.

The operation will be best understood by reference to. Fig. l and may be described as follows: I

During the downward stroke of the pump piston, the valve 10 is open and valves 19 and 25 are closed. Therefore, the suction of the piston is transmitted to the chamber 7 and a partial vacuum is created in said chamber. Before the piston uncovers the This seal will prevent air leaks be- I openings 33 provided in the cylinder Wall, the valve 10 will be positively closed by its cam, and the inlet valve 19 will be opened by its cam; and due to the partial vacuum in the chamber 7, liquid will enter the chamber 7 through the passage 16. As the piston reaches the limit of its down stroke, the openings 33 are uncovered, and air rushes into the cylinder above the piston and is compressed therein and in the passage 9 during the reverse stroke of the piston. Before the end of the upstroke, the intake valve is closed and immediately thereafter the valve 10 is opened and compressed air is admitted into the chamber 7 upon the liquid contained therein. At the same time the outlet valve 25 is opened and the compressed air eXpels all the liquid from the chamber 7 into the outlet connection 23. l/Vhen the piston reaches its upper dead center the valve 25 is closed, valve 19 remains closed and valve 10 remains open, and the parts are ready for a new cycle of operation.

If the chamber 7 is properly proportioned, it will be obvious that the liquid cannot get into the cylinder 2, owing to the fact that the vacuum in chamber 7 is only a partial vacuum. The valve 10 also prevents entering of the gasolene from the chamber 7 into the cylinder.

It will be noted that the inlet passage 16, instead of opening directly into the receiving chamber, discharges into the intermediate chamber 17 in which the liquid can accumulate after the valve 19 is closed. Upon the closing of said valve the liquid, therefore, instead of coming in contact with the valve, is met by an intermediate air cushion. I find that the provision of this cushion materially increases the eificiency of the pump, since it reduces the inertia effect which would otherwise be present.

It will be seen that my invention provides pump in which the cycle of operation is as follows:

A. Aspiration which creates a partial vacuum in an intermediate liquid receiving chamber.

B. The closing of the communication be tween the cylinder and said chamber and admission of liquid into said chamber to satisfy the degree of vacuum existing therein.

C. The closing of the intake, the opening of the exhaust and the opening of the communication between the chamber and the cylinder, in which, in the meanwhile, atmospheric pressure has been established; and

D. The entrance of compressed air into said intermediate chamber and the consequent expulsion of the liquid contained therein, together with some air. I

It will be noted that all three of the valves afiefpositively actuated by means of a single s a It will be obvious that various changes can be made in the construction and arrangement of the several parts. Thus the valves may be of different specific character; the construction of the various ports and chambers may be varied, and other changes may be made within the spirit and scope of the appended claims.

Features of my invention not claimed herein form the subject matter of my copending application Serial No. 258,818 filed of even date herewith.

I claim:

1. A pump of the character described, comprising a cylinder, a piston therein, said cylinder having means whereby it is automatically placed in communication with the atmosphere at a certain point in the movement of the piston, an air tight liquid receiving chamber having a communication with the cylinder, a valve controlling said communication, said chamber also having an inlet connection and an outlet connection, valves for controlling said connections, and means for opening and closing the several valves at the proper times; substantially as described.

2. A pump of the character described, comprising a pump cylinder, a piston to reciprocate in said cylinder, means for establishing communication between the cylinder and the atmosphere at the end of the suction stroke of the piston, a liquid receiving cham ber communicating with said cylinder, a valve controlling such communication, said chamber having inlet and outlet connections, valves for controlling said connections, and means for positively actuating the said valves to operate them in the proper sequence; substantially as described.

3. A pump of the character described, comprising a pump cylinder, a piston to reciprocate in said cylinder, means for establishing communication between the cylinder and the atmosphere at the end of the suction stroke of the piston, a liquid receiving chamber communicating with said cylinder, a valve controlling such communication, said chamber having inlet and outlet connections, valves for controlling said connections, and means for positively actuating the said valves to operate them in the proper sequence, said means comprising a ump shaft and cams or eccentrics on such s afts; substantially as described. r

4. A pump of the character described,

comprising a cylinder, a piston mounted for reciprocation in said cylinder, a rotary shaft, means carried by said shaft to actuate the piston, a liquid receiving chamber having an air passage connecting it with the air compression space of the cylinder, a valve controlling such passage, said chamber also having inlet and outlet connections, a valve controlling each of said connections, and

means on the said shaft for positively actuating the three valves in proper sequence; substantially as described.

5. A pump of the character described, comprising a cylinder, a piston therein, said cylinder having means whereby it may be placed in communication with the atmos-v phere at a certain point in the movement of the piston, a liquid receiving chamber having a communication with the cylinder, ,a valve controlling said communication, said chamber also having an inlet connection and an outlet connection, valves for controlling said connections, and means for opening and closing the several valves at the proper times, said inlet chamber connection opening into a chamber which is between the discharge of the inlet and the inlet controlling valve; substantially as described.

, 6. A pump of the character described, comprising a cylinder, a piston mounted for reciprocation in said cylinder, a rotary shaft, means carried by said shaft to actuate the piston, a liquid receiving chamber having an air passage connecting it with the air compression space of the cylinder, a valve controlling such passage, said chamber also having inlet and outlet connections, a valve controlling each of said connections, and means on the said shaft for positively actuating the three valves in proper sequence, together with means for lubricating the valves and their actuating devices; substantially as described.

7. A pump of the character described, comprising a cylinder, a piston therein, said cylinder having means whereby it may be placed in communication with the atmos phere at a certain point in the movement of the piston, a liquid receiving chamber having a communication with the cylinder, a valve controlling said communication, said chamber also having an inlet connection and an outlet connnection, valves for controlling said connections, and means for opening and closing the several valves at the proper times, said valves each having a stem, a guide for said stem, and a valve actuating follower engaging the stem and engaged by the actuating means; substantially as described.

8. A. pump of the character described, comprising a cylinder, a piston therein, a liquid receiving chamber having communication with the cylinder, means for automatically establishing atmospheric pressure in said chamber at the end of each intake stroke of said piston, a positively actuated valve controlling the communication between said chamber and said cylinder, and means controlling the admission and exhaust to andfromsaid chamber, respectively; substantially as described.

9. A pump of the character described, comprising a cylinder, a piston therein, said cylinder having means whereby it is automatically placed in communication with the atmosphere at a certain point in the movement of the piston, a liquid receiving chamber having a communication with the cylinder, a valve controlling said communication, said chamber also having an inlet connection and an outlet connection, valves for controlling said connections, and means out of contact with the liquid being pumped for opening and closing the several valves at the proper times; substantially as described.

10. A pump of the character described, comprising a pump cylinder, a piston to reciprocate in said cylinder, means for establishing communication between the cylinder and the atmosphere at the end of the suction stroke of the piston, a liquid receiving chamber communicating with said cylinder, a valve controlling such communication, said chamber having inlet and outlet connections, valves for controlling said connections, and means for positively actuating said valves to operate them in the proper sequence, said means being out of contact with the liquid being pumped; substantially as described.

In testimony whereof, I have hereunto set ANTONIN BOULADE.

' my hand. 

